Adsorption of Thiourea and Formation of Nickel-thiourea Complexes at Initial Stage of Nickel Deposition

高等学校化学研究 ›› 2004, Vol. 20 ›› Issue (6): 757-760.

Adsorption of Thiourea and Formation of Nickel-thiourea Complexes at Initial Stage of Nickel Deposition

LIU Xin-yu, HU Guang-hui, WU Hui-huang, YANG Fang-zu

State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China

收稿日期:2003-11-10 出版日期:2004-12-24 发布日期:2011-08-06
基金资助:
Supported by the National Natural Science Foundation of China(No.20073035).

Adsorption of Thiourea and Formation of Nickel-thiourea Complexes at Initial Stage of Nickel Deposition

LIU Xin-yu, HU Guang-hui, WU Hui-huang, YANG Fang-zu

State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China

Received:2003-11-10 Online:2004-12-24 Published:2011-08-06
Supported by:
Supported by the National Natural Science Foundation of China(No.20073035).

摘要/Abstract

摘要： The effect of thiourea(TU) on the nickel deposition process was analyzed by means of linear-sweep voltammetry. Raman spectroscopy and infrared reflectance spectroscopy were used to investigate the adsorption of TU and the formation of nickel-TU complexes on copper surface. The experimental results indicate that the nucleation and the preceding conversion step are involved in the deposition of nickel on copper electrodes. TU makes the onset nucleation potential negative due to the formation of nickel-TU complexes, which can accelerate the nickel deposition. Moreover, the S atom in the TU molecule adsorbed on copper surface facilitates the coordination of TU to Ni²⁺. Meanwhile, TU might be adsorbed at a flatter orientation if no Ni²⁺ is on the surface, while at a perpendicular orientation when Ni²⁺ is coadsorbed.

关键词: Thiourea(TU), Nickel deposition, Adsorption, Preceding conversion process

Abstract: The effect of thiourea(TU) on the nickel deposition process was analyzed by means of linear-sweep voltammetry. Raman spectroscopy and infrared reflectance spectroscopy were used to investigate the adsorption of TU and the formation of nickel-TU complexes on copper surface. The experimental results indicate that the nucleation and the preceding conversion step are involved in the deposition of nickel on copper electrodes. TU makes the onset nucleation potential negative due to the formation of nickel-TU complexes, which can accelerate the nickel deposition. Moreover, the S atom in the TU molecule adsorbed on copper surface facilitates the coordination of TU to Ni²⁺. Meanwhile, TU might be adsorbed at a flatter orientation if no Ni²⁺ is on the surface, while at a perpendicular orientation when Ni²⁺ is coadsorbed.

Key words: Thiourea(TU), Nickel deposition, Adsorption, Preceding conversion process

LIU Xin-yu, HU Guang-hui, WU Hui-huang, YANG Fang-zu. Adsorption of Thiourea and Formation of Nickel-thiourea Complexes at Initial Stage of Nickel Deposition[J]. 高等学校化学研究, 2004, 20(6): 757-760.

LIU Xin-yu, HU Guang-hui, WU Hui-huang, YANG Fang-zu. Adsorption of Thiourea and Formation of Nickel-thiourea Complexes at Initial Stage of Nickel Deposition[J]. Chemical Research in Chinese Universities, 2004, 20(6): 757-760.

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Adsorption of Thiourea and Formation of Nickel-thiourea Complexes at Initial Stage of Nickel Deposition

Adsorption of Thiourea and Formation of Nickel-thiourea Complexes at Initial Stage of Nickel Deposition

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